Why Choose the ABB 1SDA104944R1 YU XT5-XT6 Undervoltage Release?
The ABB 1SDA104944R1 is a genuine YU undervoltage release (UVR) accessory designed for ABB Tmax XT5 and XT6 moulded case circuit breakers (MCCBs). It automatically trips the circuit breaker whenever the supply voltage falls below the operating threshold, helping to prevent unsafe equipment operation following a voltage loss or significant voltage drop.
Designed for industrial and commercial power distribution systems, the YU XT5-XT6 220–240 V AC / 220–250 V DC undervoltage release provides dependable remote tripping and complies with internationally recognised standards including IEC 60947-2 and UL 489. Its compact, factory-engineered design ensures seamless integration with compatible ABB Tmax XT circuit breakers.
Ideal for machinery safety, emergency stop systems, building services and industrial process control, the ABB 1SDA104944R1 enhances electrical safety by ensuring that a circuit breaker cannot remain closed during an undervoltage condition or automatically reclose after power restoration without operator intervention.
Key Advantages
- Genuine ABB undervoltage release accessory.
- Compatible with ABB Tmax XT5 and XT6 MCCBs.
- Automatically trips the breaker during undervoltage conditions.
- Prevents unintended automatic restarting after power failure.
- Suitable for 220–240 V AC and 220–250 V DC control supplies.
- Supports machinery safety and emergency stop systems.
- Factory-engineered for reliable ABB circuit breaker integration.
- Suitable for industrial, commercial and infrastructure applications.
Key Features
- ABB Tmax XT accessory.
- Model: YU XT5-XT6 220–240 VAC / 220–250 VDC.
- Product code: 1SDA104944R1.
- Undervoltage release (UVR) function.
- Non-wired version.
- Compatible with XT5 and XT6 moulded case circuit breakers.
- AC/DC control voltage operation.
- Designed for quick installation inside compatible MCCBs.
- Maintenance-free operation.
- Manufactured to ABB quality standards.
How an Undervoltage Release Improves Electrical Safety
An undervoltage release continuously monitors the control supply voltage. If the voltage falls below the specified operating level or is completely lost, the accessory immediately trips the associated circuit breaker. This prevents equipment from operating under unsafe voltage conditions and helps eliminate unexpected automatic restarts once power returns.
This function is widely specified for machinery safety systems, industrial automation, emergency shutdown circuits, fire protection systems and critical building services where safe disconnection during power loss is essential.
Typical Applications
- Industrial switchboards.
- Motor control centres (MCC).
- Machine safety systems.
- Building electrical distribution.
- Emergency shutdown systems.
- Critical infrastructure installations.
- OEM control panels.
- Power distribution equipment.
